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 * Copyright (c) 2009-2022, Barthelemy Dagenais and individual contributors.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
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 *
 * - The name of the author may not be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
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package py4j.commands;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;

import py4j.Gateway;
import py4j.GatewayServer;
import py4j.Py4JException;
import py4j.Py4JJavaServer;
import py4j.Py4JServerConnection;

/**
 * <p>
 * The CancelCommand is responsible for cancelling the command on the server and shutting
 * down the associated socket in JVM.
 * </p>
 */
public class CancelCommand extends AbstractCommand {
	private Py4JJavaServer gatewayServer;

	public CancelCommand() {
		super();
		this.commandName = "z";
	}

	@Override
	public void execute(String commandName, BufferedReader reader, BufferedWriter writer)
			throws Py4JException, IOException {
		String address = reader.readLine();
		int remotePort = Integer.parseInt(reader.readLine());
		int localPort = Integer.parseInt(reader.readLine());
		if (this.gatewayServer != null) {
			this.gatewayServer.shutdownSocket(address, remotePort, localPort);
		}
	}

	@Override
	public void init(Gateway gateway, Py4JServerConnection connection) {
		super.init(gateway, connection);
		Object serverObj = gateway.getObject(GatewayServer.GATEWAY_SERVER_ID);
		if (serverObj != null && serverObj instanceof Py4JJavaServer) {
			this.gatewayServer = (Py4JJavaServer) serverObj;
		}
	}
}
